signature MLTON_ITIMER =
   sig
      datatype t =
         Prof
       | Real
       | Virtual
      val set: t * {interval: Time.time, value: Time.time} -> unit
      val signal: t -> Posix.Signal.signal
   end
- 
set (t, {interval, value})
sets the interval timer (using setitimer) specified by t to the given interval and value.
 - 
signal t
returns the signal corresponding to t.